You may already know everything there is to know about Firefly — but you still might discover something new from the huge extravaganza airing this week. Syfy comes up with a novel explanation for where superstorms come from: ghosts! Also, Avengers: Earth's Mightiest Heroes proves once and for all that it deserved a third season. My Little Pony: Friendship is Magic is back! And Deathstroke finally shows up on Arrow! [Updated with accurate information about Sunday's Firefly marathon.]

Check out tons of clips and details for all this week's television, right here.

Today:

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Revolution (10 PM, NBC):
You know what this show needed? More plucky kids. At least the promo makes it look like there's going to be some movement on the whole "explaining the blackout" front, and Miles is going to learn about the pendant.

CHARLIE MUST CONVINCE MILES TO HELP A VILLAGE OF LOST CHILDREN - When Charlie (Tracy Spiridakos) meets a boy who's suffered a plight similar to her own, she relates and longs to help him and his young friends. First, she must convince Miles (Billy Burke). Meanwhile, Rachel (Elizabeth Mitchell) grows weary of General Monroe (David Lyons) as she meets someone from her past.

Also on TV tonight: A new episode of Crash & Bernstein on Disney XD at 8:30 PM. A new Doomsday Preppers on Discovery at 9 PM. And a new Castle on ABC at 10 PM.

Tuesday:

Level Up! (7:30 PM, Cartoon Network):
You were probably just saying to yourself that you don't hear the word "Glamazon" enough. Well, here you go.

ANGIE BECOMES A GLAMAZON? - On this week's episode, Angie's fighting spirit impresses a Glamazon who leaks out to challenge Angie in a contest to the death.

Also on TV tonight: There's a new Looney Tunes Show on Cartoon Network at 8 PM.

Wednesday:

Arrow (8 PM, The CW):
Finally, our first real glimpse of Deathstroke!

DC COMICS' VILLAIN DEATHSTROKE APPEARS ON THE ISLAND WITH OLIVER - After Detective Lance (Paul Blackthorne) arrests Oliver (Stephen Amell) for murder, Oliver tells Moira (Susanna Thompson) the only lawyer he'll allow to represent him is Laurel (Katie Cassidy). Laurel takes the case which puts her at odds with her father. Oliver offers to take a polygraph in front Detective Lance but things get tense when Lance asks him if anyone else was on the island with him. Oliver flashes back to when he got his first scar, courtesy of Deathstroke (guest star Jeffrey Robinson).

"50 Shades of Green" - Marty and Debbie find out all the facts of alien love when Zabvronian mating season coincides with their wedding anniversary. Debbie longs for a little more romance in her marriage after she learns about the more cerebral Zabvronian way, while Jackie Joyner-Kersee is fascinated by humans' more physical approach. Meanwhile, a handsome jock invites Amber to a make-out party and she decides to go, with Reggie Jackson tagging along.

Supernatural (9 PM, The CW):
Garth fans, rejoice! Everybody else... you know, he does grow on you after a while. Check out a clip from this episode at left, and see what you think.

GARTH RETURNS TO HELP SAM AND DEAN ON A CASE - Sam (Jared Padalecki) and Dean (Jensen Ackles) investigate a murder and find Garth (guest star DJ Qualls) is already on the case. Dean is not happy to learn that Garth has assumed Bobby's duties, but Garth points out that both Sam and Dean have been missing for the last year and someone needed to do it. They guys discover an "avenging ghost" is responsible for the murders and they need to find the source before the killings starts again.

Nova (9 PM, PBS):
First on Nova, we explore the "Mystery of Easter Island." Then at 10 PM on Nova ScienceNow, we ask, "What Are Animals Thinking?"

Join David Pogue as he meets animals that challenge notions of what makes "us" different from "them."

American Horror Story: Asylum (10 PM, FX):
Because this show wasn't skirting the edges of good taste enough, this is the first half of a two parter, "I Am Anne Frank, Part 1":

A new patient claiming to be Anne Frank exposes Arden's past. Kit learns why Grace was admitted to Briarcliff.

Also on TV tonight: A new Ninjago: Masters of Spinjitzu on Cartoon Network at 7:30 PM. Two new episodes of Alien Surf Girls on Teennick at 9 PM. And the season finale of South Park on Comedy Central at 10 PM.

Thursday:

The Vampire Diaries (8 PM, The CW):
New clip at left. How long before everybody realizes that Professor Shane is a creepypants who's full of secrets? Given how fast things move on this show, probably half an episode.

THE HUNTER'S MARK - Stefan (Paul Wesley) and Klaus (Joseph Morgan) form an uneasy alliance to try and contain the danger that Connor (guest star Todd Williams) has unleashed on the town. When Connor takes Jeremy (Steven R. McQueen), Matt (Zach Roerig) and April (guest star Grace Phipps) hostage at the Grill, Stefan and Damon (Ian Somerhalder) have a serious disagreement about the best course of action, and Elena (Nina Dobrev) is again caught between the two brothers. The situation quickly turns violent when Klaus sends one of his hybrids, Dean (guest star Blake Hood, "The Young and the Restless") to stand up to Connor. Caroline (Candice Accola) is surprised to find Hayley (guest star Phoebe Tonkin) at the Lockwood mansion. Meanwhile, Professor Shane (guest star David Alpay) works with Bonnie (Kat Graham) to help her get past her fear and guilt.

Big Bang Theory (8 PM, CBS):
This show continues to woo geek viewers, hardcore, with the guest stars. This time around: Wil Wheaton and LeVar Burton.

"The Habitation Configuration" - Wolowitz struggles with moving out of his mother's house. Meanwhile, Sheldon is caught in the middle of an argument between Amy and Wil Wheaton.

Person of Interest (9 PM, CBS):
This show seems to be trying for more wacky comedy lately, and I'm not sure how I feel about that. This week: Reese is a fish out of water in... the suburbs! Wah wah.

"The High Road" - Reese goes undercover in an idyllic neighborhood when The Machine's latest number sends him to the suburbs.

Beauty and the Beast (9 PM, The CW):
Our new guilty pleasure sounds like it's just going to get guiltier and guiltier. Check out a clip at left.

A KISS IS JUST A KISS — Vincent (Jay Ryan) is captured on a convenience store surveillance video while preventing a robbery, and Cat (Kristin Kreuk) warns him to be extra careful when his photo appears in the newspaper. Cat and Tess (Nina Lisandrello) investigate the disappearance of a woman named Amy (guest star Annie Murphy), who has gone missing after her fiancée, Dr. Michael Walters (guest star Jeremy Glazer), surprised his bride-to-be by placing their engagement announcement in the paper that morning. Evan (Max Brown) runs Amy's fingerprints and discovers her true identity, while Cat wonders if her disappearance was intentional after Vincent mentions that he and JT (Austin Basis) have an escape plan to clear out of their loft without a trace in a matter of minutes. Later, Michael also goes missing and Joe (Brian White) learns that his team has been deceived. Meanwhile, Heather (Nicole Gale Anderson) is planning a surprise birthday party for her sister, forcing Cat to postpone her birthday plans with Vincent. At the party, Cat and Evan share a surprising moment.

Last Resort (9 PM, ABC):
One reason to keep watching this show: just to find out how long they can keep this premise spinning. This week, it sounds like there are going to be loads of wacky hallucinations, due to a crazy drug attack:

"Another Fine Navy Day" - The crew is hit with an attack by an unknown force unlike anything they've seen before. As confusion and aggression take hold, Marcus and Sam can no longer trust their own senses even as they race to save the sub and defend the island.

Also on TV tonight: There's a new episode of Mad on Cartoon Network at 8. And then the two-hour premiere of Burn Notice on USA at 9 PM. And a new Elementary on CBS at 10.

Friday:

Tron Uprising (7:30 PM, Disney XD):
In "Grounded,"

The Renegade is challenged by Tesler to a showdown in Argon Square, but Beck's plans to confront his nemesis are thwarted when Able angrily grounds him at the Garage due to his constant absences. Beck must choose between his duty to Able and his responsibilities as The Renegade in order to save a group of programs Tesler is using as bait.

And that's followed by a brand new Motorcity at 8:30 PM.

Fringe (9 PM, Fox):
How soon are we going to start seeing some effects from Peter's bit of surgery in Friday's episode? Just check out the promo at left and see for yourself.

A Fringe team member takes on a new role, and Walter follows leads to a key piece needed in the battle against the Observers.

Grimm (9 PM, NBC):
Sounds like Hank is going to get some much-needed development:

HANK'S KNOWLEDGE OF NICK'S WORLD HAS HIM SECOND GUESSING A PAST CASE — JASON GEDRICK AND LISA VIDAL GUEST STAR — Hank (Russell Hornsby) starts reflecting on an arrest he made earlier in his career regarding a man (guest star Jason Gedrick) who committed murder claiming "self-defense against monsters." With the man's death sentence rapidly approaching and the knowledge he's recently gathered from Nick (David Giuntoli), Hank begins to wonder if there was more truth to the man's seemingly absurd story then he once thought. Back at the spice shop, Monroe (Silas Weir Mitchell) finds himself involved in a situation he never saw coming.

Haven (10 PM, Syfy):
The second half of the big two-parter guest-starring Claudia Black! And here's what to expect:

Audrey and Duke return from Colorado; Audrey, Duke and Tommy tries to find the woman with the resurrection touch.

Also on TV tonight: There's a brand new Nikita on The CW at 9 PM. There's a new Phineas and Ferb at 9 PM on Disney. At 10 PM, Nicktoons has a brand new Monsuno, followed by a new Dragon Ball GT.

Saturday:

The younglings' ship is attacked by Hondo's pirates when they return from Illum. The younglings fight back with improvised traps.

My Little Pony: Friendship is Magic (10 AM, The Hub):My Little Pony is back, with a whole hour of new episodes! (Thanks to Discord the Draconequus for the heads up!) Check out a clip at left, and here's the skinny on "The Crystal Empire, Parts 1 and 2":

After a thousand-year curse vanishes, the Crystal Empire reappears in Equestria's north. Princess Celestia calls upon Twilight Sparkle and her friends to protect the empire from harm.

An action packed chase led by Hal and Ashley to save the people on this small island from a strange electrical storm which is led by angry souls from a mass suicide looking for revenge.

Yes, you read that correctly. It's an electrical storm caused by angry souls from a mass suicide. You have to admire Syfy's timing, so soon after Hurricane Sandy.

Bedlam (Midnight, BBC America):
The second season finale — note new timeslot. "Max is haunted by his father; Warren reaches rock bottom; Ellie faces the truth about her past."

Also on TV today: A new Ben 10: Omniverse on Cartoon Network at 9 AM. New episodes of Robot and Monster and Power Rangers on Nickelodeon starting at 12:30 PM. A brand new Kaijudo: Rise of the Duel Masters at 2 PM on The Hub. Also, a new R.L. Stine's The Haunting Hour: The Series on The Hub at 6 PM.

Sunday:

Avengers: Earth's Mightiest Heroes (11:30 AM, Disney XD):
It's the season — and, I guess, series — finale. Sniff. At least this show is going out with a bang. A cosmic bang!

The Avengers have fought super villains, dinosaurs, time-travelling conquerors, and shape-shifting aliens, but that all pales in comparison with the arrival of the insatiable Galactus and his awe-inspiring heralds. In order to save the world, the galaxy and the universe, the Avengers have to rely on all the help they can get.

Once Upon a Time (8 PM, ABC):
What can this show possibly add to up the ante? More werewolves — and Annabeth Gish!

"Child of the Moon" - Ruby's fear about turning into a wolf during the first curse-free Storybrooke full moon is confirmed when one of the town's residents is viciously murdered, and Ruby is the prime suspect; Decker - aka King George - threatens to expose David as a shepherd, not a prince, and not fit to run the town as sheriff; and Leroy stumbles upon some treasure in the Storybrooke mine that could help bring Mary Margaret and Emma back into our world. Meanwhile, in the fairytale land that was, Red Riding Hood finds a kindred spirit in Anita (Annabeth Gish), a charismatic and mysterious leader of a pack of humans who, like Red, turn out to be wolves.

The Walking Dead (9 PM, AMC):
Check out a sneak peek from "Say The Word." In which:

Rick struggles after experiencing another loss; Michonne has her suspicions about the Governor, who throws a party for the people of Woodbury, but gives it an unusual twist.

The Family Guy (9 PM, Fox):
It's the 200th episode, and the show is giving us a special time travel event.

When Brian uses Stewie's time machine to impress women whom he meets at bars, he accidentally causes time to run in reverse. So he and Stewie must figure out how to restore the forward progress of time before Stewie is unborn. Then, in the FAMILY GUY 200th Episode retrospective, fans will get a behind-the-scenes look at this irreverent comedy's most outrageous moments, through fascinating interviews with creator Seth MacFarlane and voice actors Mila Kunis, Alex Borstein and Seth Green.

Firefly: Browncoats Unite! (10 PM, Science):
This is the culmination of a day-long celebration of Firefly on the Science Channel, including "special edition" versions of two episodes. (Correction: I've heard from the Science Channel that there aren't any "special edition" episodes after all.) And this one-hour special isn't just featuring stuff from the Comic Con panel, but also never-before-seen secrets from the set. Here are the details, via Science's press release:

Science Channel reunites Joss Whedon, Nathan Fillion and the entire renegade crew of the Serenity for the first time ever to provide the complete oral history on the franchise that continues to explode in popularity - despite meeting its end a decade ago. The 60-minute special includes secrets from the set, exclusive cast interviews, and footage from this year's colossal Comic-Con panel that dominated the pop culture conversation. Joining Whedon and Fillion for FIREFLY: BROWNCOATS UNITE are Serenity crewmembers Sean Maher, Summer Glau, Adam Baldwin, Morena Baccarin, Alan Tudyk, Gina Torres and Jewel Staite; along with executive producer Tim Minear and executive story editor Jose Molina.

Science Channel's FIREFLY Sunday extravaganza begins at 7AM ET/PT with an all-day marathon of the series. Then, at 10PM ET/PT, the event Browncoats everywhere have been waiting for - FIREFLY: BROWNCOATS UNITE premieres on Science Channel.

FIREFLY the series is set in the year 2517, in a new star system and follows the adventures of the ragtag crew of Serenity, a "Firefly-class" spaceship. The ensemble cast depicts nine distinct characters who, have all banded together for very different reasons. Led by Captain Mal Reynolds (Fillion), who fought on the losing side of a civil war, viewers engage with characters who, are now living on the outskirts of society.

"Downward Spiral" - Henry's political career continues to rise when he receives a special commendation from the Mayor for his heroic actions. However his exultation is tempered by Jane's ever-changing mood about staying at The Drake, where she no longer feels safe. Meanwhile, Jane discovers that both Nona and her missing grandmother, Lottie Clark, have mysterious connections to the building; Brian determines that Alexis has been duplicitous when it comes to Louise and her "affair" with Dr. Evans; and back at the hospital, the good doctor learns the unethical terms of his payback to Gavin in exchange for his help. Finally, Jane and Nona discover one of The Drake's ultimate secrets as they search for Lottie - a secret that will change Jane's life forever.

Robot Chicken (Midnight, Adult Swim):
According to Wikipedia, which continues to be the only source of info on upcoming Robot Chicken episodes, here's what to expect from "Butchered in Burbank":

The first thanksgiving gets awkward; what Pinky and Brain do after the show; Mario gets an embarrassing three way hangover, and the Peanuts characters meet Michael Myers on Halloween night.

That's followed by a brand new Superjail!.

Also on TV today: There's a new Winx Club on Nickelodeon at 1 PM. And a brand new Mythbusters on Discovery at 8 PM. And most excitingly, a new Dog With a Blog at 8 PM on Disney.